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Psilalcis conceptaria sp. n.  
Ectropis intermedia Warren sensu Holloway, 1976: 79, fig 602.

Psilalcis conceptaria

, 13-14mm. The facies is very similar to that of P. intermedia, P. lophomeris Prout comb. n. and P. impos Prout comb. n. from Burma and P. rantaizana Wileman, the postmedials of both wings punctate, sinuous, converging on the forewing dorsum with a diffuse medial fascia. A further undescribed species occurs in Tonkin (slide 13415) that has a trifid valve structure very similar to that of conceptaria. The setose digitate process from the ventral edge of the valve costa has migrated to the base of a central laminate lobe; the cucullus, present in intermedia, is vestigial in conceptaria with the setose costal digitate process of intermedia set more distally, broader, less long and slender (or this may be homologous with the cucullus, separated from the central lamina, the costal process in intermedia being absent); the apex of the sacculus is downturned, thumb-like, whereas in intermedia it is acute, bearing a long straight setal spine. In the aedeagus vesica of both there is a cluster of needle-like cornuti on a lateral lobe. The apex of the aedeagus is a curved, slender spine in conceptaria, broad, acute with a lateral spur in intermedia. The female genitalia have a broad, triangular flanged margin to the ostium, a short ductus, an elongate bursa with a central constriction: there are basal corrugations, sclerotised, in the basal half, and two opposed sclerotised patches, circular, with four or five longitudinal ridges, at the base of the distal half.

Holotype . SABAH: Kundasan, 1050m, Cambridge Expedition to Mt. Kinabalu 1965 (H.J. Banks, H.S. Barlow & J.D. Holloway) Brit. Mus. 1968-186, BM geometrid slide 9273.

Paratypes. 16 examples, both sexes, SARAWAK: Gunung Mulu Nat. Park, R.G.S Exped. 1977-8 (J.D. Holloway et al.) Sites 14 & 15, February, Camp 2.5, Mulu, 1000m, 413461, [lower montane forest]. BM geometrid slides 13223(), 15938(), 11679(venation).

Geographical range. Borneo.

Habitat preference. The species is restricted to lower montane forest.

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